JBL 508 GTi User Manual / Operation Manual ▷ View online
and high frequency transducers in a high
quality system, we recommend you use
either a high quality active crossover
such as JBL’s GTX47, GTX4 or GTX2
to provide optimum matching to your
subwoofer or woofer/midbass loudspeaker.
If you prefer passive crossovers, we
recommend that you use only high quality
audiophile grade film-type capacitors
and Low DCR inductors to get the most
out of your system. The most popular
system configuration is a hybrid using
an active crossover for the subwoofer to
woofer/midrange crossover point, and a
passive crossover for the woofer/midrange
to tweeter crossover. Your GTi Competition
Series Dealer is uniquely qualified to help
guide you on the best system configuration
for your needs.
quality system, we recommend you use
either a high quality active crossover
such as JBL’s GTX47, GTX4 or GTX2
to provide optimum matching to your
subwoofer or woofer/midbass loudspeaker.
If you prefer passive crossovers, we
recommend that you use only high quality
audiophile grade film-type capacitors
and Low DCR inductors to get the most
out of your system. The most popular
system configuration is a hybrid using
an active crossover for the subwoofer to
woofer/midrange crossover point, and a
passive crossover for the woofer/midrange
to tweeter crossover. Your GTi Competition
Series Dealer is uniquely qualified to help
guide you on the best system configuration
for your needs.
Component Placement
The location of each of the
loudspeakers plays a vital role in achieving
proper frequency response and spacious
imaging. Because the 408 and 508GTi
systems have an extremely wide and
proper frequency response and spacious
imaging. Because the 408 and 508GTi
systems have an extremely wide and
smooth dispersion pattern, excellent
performance may be achieved in any
vehicle. Due to the wide variety of vehicles,
there is not one “right” way to locate the
408 and 508GTi, however knowledge of
the following considerations will help you
get the most from your system:
1.
performance may be achieved in any
vehicle. Due to the wide variety of vehicles,
there is not one “right” way to locate the
408 and 508GTi, however knowledge of
the following considerations will help you
get the most from your system:
1.
The most spacious stereo image is
achieved when the speakers are placed
as wide apart as possible.
achieved when the speakers are placed
as wide apart as possible.
2.
The best center image will be achieved
when the distance from the left speaker
to your left ear is as equal as possible to
the distance from the right speaker to
your right ear. This is most easily
achieved by placing the 408 or
508GTi as far forward as you can.
when the distance from the left speaker
to your left ear is as equal as possible to
the distance from the right speaker to
your right ear. This is most easily
achieved by placing the 408 or
508GTi as far forward as you can.
3.
The best system integration is achieved
when the woofer/midrange is mounted
close to the tweeter. Installing the
tweeter close to the woofer/midrange
helps smooth the transition from
woofer/midrange to tweeter at the
crossover point.
when the woofer/midrange is mounted
close to the tweeter. Installing the
tweeter close to the woofer/midrange
helps smooth the transition from
woofer/midrange to tweeter at the
crossover point.
4.
You will get the best frequency
response when the path from the
speakers to your ear is unobstructed.
response when the path from the
speakers to your ear is unobstructed.
5.
Because of the high acoustic energy
capability of the 408 and 508GTi, the
woofer/midrange drivers must be
securely mounted in a rigid panel which
is free from resonances, rattles and air
leakage.
capability of the 408 and 508GTi, the
woofer/midrange drivers must be
securely mounted in a rigid panel which
is free from resonances, rattles and air
leakage.
Installation Warnings and Tips
•
Be careful not to cut or drill into fuel
tanks, fuel lines, brake or hydraulic
lines, vacuum lines or electrical wiring
when working on your vehicle. Inspect
behind panels before you cut or drill.
tanks, fuel lines, brake or hydraulic
lines, vacuum lines or electrical wiring
when working on your vehicle. Inspect
behind panels before you cut or drill.
•
Be sure to check for clearance of
window, cranks and linkages when
mounting speakers in door panels.
window, cranks and linkages when
mounting speakers in door panels.
•
Do not use the speakers unmounted.
Failure to securely mount this product
could result in damage or injury,
particularly in the event of an accident.
Failure to securely mount this product
could result in damage or injury,
particularly in the event of an accident.
•
Although the materials used on the 408
and 508GTi are inherently water
resistant, do not mount the speakers
where they will get wet.
and 508GTi are inherently water
resistant, do not mount the speakers
where they will get wet.
•
Always disconnect the ground wire
from the battery before doing any work
on the vehicle.
from the battery before doing any work
on the vehicle.
5
408/508 MANUAL.QXP 7/17/98 11:21 AM Page 5
Mounting Instructions
Pick a mounting location after reading
the recommendations in the Component
Placement section of this manual.
Placement section of this manual.
Installing the GTi System
Crossover
Crossover
The GTi system crossover should be
mounted securely to prevent damage to
the crossover or possible loosening of
wiring connections. Choose one of the
crossover mounting methods and follow
the directions below:
the crossover or possible loosening of
wiring connections. Choose one of the
crossover mounting methods and follow
the directions below:
Mounting the GTi Crossover with Wire Ties
1.
1.
Remove the crossover cover as shown
in Figure L.
in Figure L.
2.
Remove the crossover board from the
plastic case.
plastic case.
3.
Use wire ties to secure the plastic case
to the desired location as shown in
Figure A.
to the desired location as shown in
Figure A.
4.
Cut off the excess plastic on the wire ties.
5.
Re-install the PCB and install wiring
from the crossover to the amplifier
and speaker locations as shown in
Figure K.
from the crossover to the amplifier
and speaker locations as shown in
Figure K.
6.
Re-install the crossover cover.
Mounting the GTi Crossover with Screws
1.
1.
Remove the crossover cover as
shown in Figure L.
shown in Figure L.
2.
Remove the crossover board from the
plastic case.
plastic case.
3.
Mark 4 hole locations, drill holes and
secure the bottom cover to the desired
mounting location as shown in Figure B.
Before starting make sure no electrical
or other critical car components are
located where you will be drilling.
secure the bottom cover to the desired
mounting location as shown in Figure B.
Before starting make sure no electrical
or other critical car components are
located where you will be drilling.
4.
Re-install the PCB and install wiring
from the crossover to the amplifier
and speaker locations as shown in
Figure K.
from the crossover to the amplifier
and speaker locations as shown in
Figure K.
5.
Re-install the crossover cover.
Note: Do not mount the GTi Crossover in a
location where it can get wet, as this
may cause damage to its components.
may cause damage to its components.
6
Figure C
Figure A
Figure B
MOUNTING RING
ADAPTER
ADAPTER
WOOFER/
MIDRANGE
MIDRANGE
408/508 MANUAL.QXP 7/17/98 11:21 AM Page 6
Woofer/Midrange Driver
Mounting
Mounting
Mounting the Woofer/Midrange to
Stock Hole Locations
1.
Stock Hole Locations
1.
Access the stock speaker location and
remove the stock speaker. The 408
and 508GTi include mounting ring
adapters which allow the speaker to
be mounted in standard 4" and 5
remove the stock speaker. The 408
and 508GTi include mounting ring
adapters which allow the speaker to
be mounted in standard 4" and 5
1
/
4
"
holes respectively.
2.
Attach the mounting ring adapter to
the stock location using four #8 x 1
the stock location using four #8 x 1
1
/
4
"
screws as shown in Figure C.
3.
Attach the foam gasket to the back of the
woofer/midrange. Connect the speaker
wire from the crossover terminals marked
“W” to the speaker by either soldering
(preferred) or using crimp terminals.
Connect the wire from the “W+” terminal
on the crossover to the red “W” terminal
on the woofer/midrange. Repeat the
same process for the “W–” terminal (see
Figure K for details).
woofer/midrange. Connect the speaker
wire from the crossover terminals marked
“W” to the speaker by either soldering
(preferred) or using crimp terminals.
Connect the wire from the “W+” terminal
on the crossover to the red “W” terminal
on the woofer/midrange. Repeat the
same process for the “W–” terminal (see
Figure K for details).
4.
Mount the woofer/midrange driver to
the adapter ring using three #8 x
the adapter ring using three #8 x
5
/
8
"
screws and three shoulder washers
as shown in Figure C.
as shown in Figure C.
5.
Replace the stock speaker panels.
Mounting the Woofer/Midrange in
Custom Locations
Custom Locations
1.
Snap the grille assembly of the speaker
onto the driver and choose three hole
locations so that the grille logo is oriented
as desired for your installation. Use the
Fabric Displacement Ring included in the
package to mark the location of the three
screw holes and the speaker cutout
holes (cutout hole sizes are listed in the
Specifications section). Before cutting or
drilling make sure that there are no car
components, electrical wiring or any
other items that could be damaged.
onto the driver and choose three hole
locations so that the grille logo is oriented
as desired for your installation. Use the
Fabric Displacement Ring included in the
package to mark the location of the three
screw holes and the speaker cutout
holes (cutout hole sizes are listed in the
Specifications section). Before cutting or
drilling make sure that there are no car
components, electrical wiring or any
other items that could be damaged.
2.
Cut out the speaker hole at the
mounting location and drill the three
marked holes with a
mounting location and drill the three
marked holes with a
1
/
8
" (3mm) drill.
3.
Run speaker wire to the hole location,
making sure that either an active or
the included passive crossover is
connected to the speaker (see Figure K
for wiring details).
making sure that either an active or
the included passive crossover is
connected to the speaker (see Figure K
for wiring details).
4.
Put the speaker Fabric Displacement
Ring under the speaker as shown in
Figure D.
Ring under the speaker as shown in
Figure D.
5.
Attach the foam gasket to the back of the
woofer/midrange. Connect the speaker
wire from the crossover terminals marked
“ W” to the speaker by either soldering
(preferred) or using crimp terminals.
Connect the wire from the “W+” terminal
on the crossover to the red “W” terminal
on the woofer/ midrange. Repeat the
same process for the “W–” terminal (see
Figure K for details).
woofer/midrange. Connect the speaker
wire from the crossover terminals marked
“ W” to the speaker by either soldering
(preferred) or using crimp terminals.
Connect the wire from the “W+” terminal
on the crossover to the red “W” terminal
on the woofer/ midrange. Repeat the
same process for the “W–” terminal (see
Figure K for details).
6.
Mount the speaker to the hole location
using three #8 x 1
using three #8 x 1
1
/
4
" screws and three
shoulder washers as shown in Figure D.
7.
Push the grille down onto the speaker
making sure the tabs on the speaker
match with the slots in the grille. Twist
the grille about
making sure the tabs on the speaker
match with the slots in the grille. Twist
the grille about
1
/
2
" (12mm) clockwise to
lock the grille into place.
7
FABRIC
DISPLACEMENT
RING
DISPLACEMENT
RING
WOOFER/
MIDRANGE
MIDRANGE
Figure D
408/508 MANUAL.QXP 7/17/98 11:21 AM Page 7
Note: The metal grille is designed so
that it can be covered with grille cloth if
desired. Simply, remove the metal grille
from the grille frame as shown in Figure E.
Then use spray adhesive to glue and wrap
the grille cloth to the metal grille. Push the
metal grille with cloth back in the grille
frame. For even better interior matching it
is also possible to use plastic compatible
paint to match the grille frame to the
vehicle’s interior.
desired. Simply, remove the metal grille
from the grille frame as shown in Figure E.
Then use spray adhesive to glue and wrap
the grille cloth to the metal grille. Push the
metal grille with cloth back in the grille
frame. For even better interior matching it
is also possible to use plastic compatible
paint to match the grille frame to the
vehicle’s interior.
Logo Orientation on Grille
The orientation of the logo on the
metal grille relative to the grille frame can
be adjusted. Simply remove the metal
grille and reassemble the metal grille to
the grille frame utilizing a different tab slot.
be adjusted. Simply remove the metal
grille and reassemble the metal grille to
the grille frame utilizing a different tab slot.
Mounting the
408 and 508GTi Tweeter
408 and 508GTi Tweeter
The 408 and 508GTi Tweeter includes
accessories for four different mounting
configurations. Take a look at all the
possibilities described in the following
paragraphs, pick one, follow the steps and
you’ll soon be done!
configurations. Take a look at all the
possibilities described in the following
paragraphs, pick one, follow the steps and
you’ll soon be done!
Tweeter Surface Mounting
Instructions
Instructions
a) Using the Mounting Plate Template at
the back of this manual. Pick a mounting
location for the tweeter making sure that
speaker wire can be run to this location.
Flat surfaces work best. Drill the holes as
shown on the template in the desired
mounting location. Use three
the back of this manual. Pick a mounting
location for the tweeter making sure that
speaker wire can be run to this location.
Flat surfaces work best. Drill the holes as
shown on the template in the desired
mounting location. Use three
3
⁄
4
"
mounting screws to secure the mounting
plate in place as shown in Figure F.
plate in place as shown in Figure F.
b) Run wire from the 408 and 508GTi
Crossover to the wire feed-through hole
and connect the wire to the tweeter
making sure to connect + to + and – to –
by either soldering (preferred) or using
crimp-on connectors.
Crossover to the wire feed-through hole
and connect the wire to the tweeter
making sure to connect + to + and – to –
by either soldering (preferred) or using
crimp-on connectors.
c) Push the tweeter down onto the
mounting plate making sure to line up the
bayonet tabs with the slots in the tweeter
housing.
mounting plate making sure to line up the
bayonet tabs with the slots in the tweeter
housing.
d) Twist the tweeter clockwise about
1
⁄
4
" to
lock it into position.
8
A
C
B
TWEETER SURFACE MOUNT INSTALLATION
Figure F
GRILLE
FRAME
FRAME
METAL
GRILLE
GRILLE
Figure E
408/508 MANUAL.QXP 7/17/98 11:21 AM Page 8
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